Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb13f53f11207097…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 12:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f9c7a34bb98796c0c07944c6563ccac SHA-1: 2b5a37183ceb0e00385dca795eaf06835b78f5b9 SHA-256: fb13f53f11207097159330c94fa1e5298c062531844c5372ce3367d1e63ffdfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO spam campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/award?keyword=vernier+caliper+pdf
    • http://karnaval.host/tinkers_construct_2_modifiers73k1f.pdf
    • https://cdn.sqhk.co/xekutenupi/ggigjaf/58762253044.pdf
    • http://bupitubegedew.getenjoyment.net/goxotulukopabosajesiko.pdf
    • https://cdn.sqhk.co/wanoposuj/bN3Cjf7/dungeons_and_dragons_online_gameplay_guide.pdf
    • http://fozivot.mypressonline.com/95589449935.pdf
    • https://cdn.sqhk.co/xejudawadoni/hchfjaR/iphone_7_volume_booster_app.pdf
    • http://fitnesspack.net/scratch_2_flappy_bird_downloadz5qmu.pdf
    • http://lishop.site/tujisetuzobimowiym1ez.pdf
    • https://cdn.sqhk.co/ludukuni/UMYtik4/27209150367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_8d037debbf5c45109d1d793e47f4b0de.pdf?index=true
    • https://s3.amazonaws.com/kofabube/907763960.pdf
    • https://s3.amazonaws.com/pisik/movie_box_pro_android_tv_apk.pdf
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_c97dff7132ea480db46194cd49044449.pdf?index=true
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_b87063a57225418d8b828df2391c013c.pdf?index=true
    • https://s3.amazonaws.com/dotivaf/harmony_elite_hub_review.pdf
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_cb252c6973be4b84905716b77f522dfc.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_5e4bceceae0643758c650ec01d0dfc92.pdf?index=true
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_3743acac144e4fb6b86e4b66442dc5e9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13a.bin
8b77e8dfb57291dfc0933461796d1ce3ad52e6f5a2a3cb5ab5b279199d7a7d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 4936 bytes
font_01_sfnt_off0001021c.bin
4a0a5d20688abcdd51af4ffe288f5bc65613b54dfab90928e39aa948c6a035e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 12096 bytes

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